1,362 research outputs found

    A study of antenna and radio frequency tracking system Final summary report, 1 Feb. 1963 - 30 Nov. 1965

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    Phase stability of very low frequency radio signal propagation, electronically scanned tracking antenna array, and inverted rf tracking syste

    Re-examination of the Effects of Food Abundance on Jaw Plasticity in Purple Sea Urchins

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    Morphological plasticity is a critical mechanism that animals use to cope with variations in resource availability. During periods of food scarcity, sea urchins demonstrate an increase in jaw length relative to test diameter. This trait is thought to be reversible and adaptive by yielding an increase in feeding efficiency. We directly test the hypotheses that (1) there are reversible shifts in jaw length to test diameter ratios with food abundance in individual urchins, and (2) these shifts alter feeding efficiency. Purple sea urchins, Strongylocentrotus purpuratus, were collected and placed in either high or low food treatments for 3 months, after which treatments were switched for two additional months between February and September, 2015 in La Jolla, CA (32.8674°N, 117.2530°W). Measurements of jaw length to test diameter ratios were significantly higher in low compared to high food urchins, but this was due to test growth in the high food treatments. Ratios of low food urchins did not change following a switch to high food conditions, indicating that this trait is not reversible within the time frame of this study. Relatively longer jaws were also not correlated with increased feeding efficiency. We argue that jaw length plasticity is not adaptive and is simply a consequence of exposure to high food availability, as both jaw and test growth halt when food is scarce

    Application of LANDSAT data to delimitation of avalanche hazards in Montane, Colorado

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    The author has identified the following significant results. Photointerpretation of individual avalanche paths on single band black and white LANDSAT images is greatly hindered by terrain shadows and the low spatial resolution of the LANDSAT system. Maps produced in this way are biased towards the larger avalanche paths that are under the most favorable illumination conditions during imaging; other large avalanche paths, under less favorable illumination, are often not detectable and the smaller paths, even those defined by sharp trimlines, are only rarely identifiable

    A Decade Later – US 31 Mitigation

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    Significant transportation projects are designed and built, but that’s not the end of the story. Wetland and stream mitigation efforts, including monitoring and maintenance, may continue for a decade. This presentation will showcase INDOT mitigation sites—from their creation a decade ago to the awesome results—for projects like US-31. We’ll share timelines, photos, quality data, and challenges identified and addressed over the years

    Experiments in Voice and Visibility: Creating Space for Graduate Student (Single) Mothers in the Mother-Free Space of the Academy

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    In my doctoral department, the invisibility of my situation as a single mother andthe way it was so often at odds with academic culture left me feeling alienated frommy peers and my community. In an effort to balance school and single motherhood,to make visible the reality of my situation, and to connect more deeply with my ac-ademic community, I begin a series of research experiments in voice and visibility.These projects often involved my son, as he was an inextricable part of my situationas a mother. Moreover, his life and our relationship were undoubtedly impacted by“my situation” as a graduate student. In this essay, I discuss a few experiments invoice and visibility that were instrumental to getting through my doctoral program.These projects involved risk, creative strategies, and lots and lots of support fromother members of my community. I hope sharing these stories might inspire othergraduate student mothers to push through even when it feels impossible. Likewise, Ihope faculty members and graduate students will be inspired to support and empowerthe mothers in their respective departments

    Spreading Stupidity: Intellectual Disability and Anti-Imperialist Resistance to Bioinformational Capitalism in Bioinformational Philosophy and Postdigital Knowledge Ecologies

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    We are aware that to resist in the coming age of bioinformational capitalism, we will require new knowledge ecologies. These knowledges must be socialist: able to resist the dominance of productivist and imperialist pedagogies that are saturated with capital, and now bioinformational capital’s aims. These knowledges must also be stupid: able to refuse bioinformational capital’s lust for visibility and access to the working class biology. Stupidity is able to resist primarily because it can’t be quantified, articulated, or rendered transparent. To express the importance of this refusal, we visit concepts of colonialism and disability. Disabled and colonized struggles animate the importance of protecting anti-value: and using anti-value in the struggle against oppression. In this paper, we propose a theory and practice of stupidity as anti-value: a socialist and anti-imperialist form of resistance

    Classifying Risky-Drinking College Students: Another Look at the Two-Week Drinker-Type Categorization

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    Objective The present study examined the effectiveness of the 2-week period currently used in the categorization of heavy episodic drinking among college students. Two-week drinker-type labels included the following: nonbinge drinker, binge drinker, and frequent binge drinker. Method Three samples of college student drinkers (104 volunteers, 283 adjudicated students, and 238 freshmen male students) completed the 3-month Timeline Followback assessment of drinking. Drinking behavior during the last 2 weeks of the month before the study was compared with drinking behavior during the first 2 weeks of the same month to compare behavior and resulting labels during both 2-week periods. Results Inconsistencies existed in drinker-type labels during the first 2 weeks of the month and the last 2 weeks of the month for all three samples. Between 40% and 50% of participants in the three samples were classified as a different drinker type across the month. Nonbinge drinkers experienced a wide range of alcohol-related problems, and much variation existed among the frequent-binge-drinker label. Conclusions The results suggest that the current definition needs to be modified to accurately identify risky-drinking college students. Expanding the assessment window past 2 weeks of behavior, as well as developing different classification schemes, might categorize risky drinkers more accurately
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